Then you must have a PC Kindle Reader Registered. Which is certainly less private than registering the physical Kindle. Also, unless it's totally ancient, you can't create collections on an unregistered Kindle. There is no point in not registering one if you have an Amazon account to buy ebooks anyway. Also not all OSes support the Kindle Application.
I only download to PC too, but I have no Amazon software at all on the PC. The plugin on Calibre has the kindle serial number, which doesn't work unless the ebook was bought for that registered Kindle. Though some Amazon ebooks don't have DRM unless you let them deliver KFX, which illegally adds DRM to books a publisher requested as DRM free.
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